<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        button:active {
        background-color: green;
    }
    
    button:focus {
        background-color: blue;
    }
    
    button:hover {
        background-color: red;
    }
    </style>
</head>
<body>
    <button>Hello</button>
</body>
</html>